Excel Writer created XLSX file only readable by interface after open save close routine

Dear KNIME community,

I am experiencing problems reading an XLSX file created via Excel Writer Node via an interface (that likely tries to read the file in XML-schema).

I discovered that the problem gets resolved if I manually open and save the file in Excel prior to starting the import via interface.

At the same time I see that the file size increases significantly between the initially create file (Excel Writer Node) and the filesize after opening and saving via Excel.

I do not get an error message when executing the workflow (I am runnint version 4.7.). I also do not get any error or prompt when opening the created file in Excel.

I fixed the problem on my local machine by running a .bat file that would open, save and close the created file - however the .bat file cannot be executed on the target system.

Hence I need to get KNIME to writing the XLSX file in the “right” (i.E. machine-readable) format.

Any ideas how to fix this - a solution would be highly appreciated!

Thank you very much in advance and kind regards,

Denis